[A clinical study of co2-elimination using a modified bain-system (author's transl)].
Of three groups of anaesthetized and intubated patients (n = 7) under controlled ventilation two received fresh gas flows of 70 ml/kg . min, 100 ml/kg . min and 130 ml/kg . min either in increasing or in decreasing amounts via a Bain circuit, while the third group was ventilated via a conventional semi-closed anaesthesia circuit. Blood gas analyses and cardiovascular parameters were recorded. In one patient temperatures and relative humidities of in- and expired gases were obtained by psychrometry. A modification of the Bain system afforded control of respiratory minute volumes and airway pressures. CO2-elimination proved to be adequate at a fresh gas flow of 130 ml/kg. min. At 100 ml/kg. min it was acceptable still, however pH values were outside normal range. With 70 ml/kg . min mean capillary pCO2 values (42.6 mmHg and 43.2 mmHg) and mean pH values (7.32 and 7.33) in the two respective groups proved a respiratory acidosis. Capillary pO2 was above 100 mmHg in all groups. Temperature and relative humidity of inspired gases were 24 degrees C and 40 per cent, 23 degrees C and 25 per cent, 22 degrees C and 3 per cent at fresh gas flows of 70, 100 and 130 ml/kg . min respectively.
D000328:Adult; D000368:Aged; D001835:Body Weight; D002245:Carbon Dioxide / Q000378:metabolism*; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D006813:Humidity; D006863:Hydrogen-Ion Concentration; D008875:Middle Aged; D010101:Oxygen Consumption; D011312:Pressure; D012123:Pulmonary Ventilation; D013696:Temperature; D012122:Ventilators, Mechanical / Q000592:standards*
D002245:Carbon Dioxide
Klinisch-experimentelle Untersuchungen zur CO2-Elimination mit Hilfe eines modifizierten Bain-Systems.